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Sucrose has the following formula: C12H22O11

From the periodic table:
mass of carbon = 12 grams
mass of hydrogen = 1 gram
mass of oxygen = 16 grams

molar mass of sucrose = 12(12) + 22(1) + 11(16) = 342 grams

number of moles = mass / molar mass = 150 / 342 = 0.4385 moles
250 ml = 0.25 liters

molarity can be calculated as follows:
molarity = number of moles of solute / liters of solvent
molarity = 0.4382 / 0.25 = 1.75 M

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